“You can see his foot step onto the floor as he moves past the camera and the shape of his head.

"People have said it could be smoke but smoke rises, it doesn't move around so quickly like that.

“If I thought it was smoke I would never have shared it online as we got a lot of backlash from it.

"The feeling was quite nice in the end that he came back to see us.

“Since Mutley's visit we have not had any more problems."

Expert Castellano, founder of Graves Paranormal Investigations in Maine, US, said: "Having viewed that video, I contacted [Barry] after I sent it to a paranormal friend who analyses pics and videos of paranormal nature.

"After the results deemed that the video was legitimate and untouched by any fraud measures I did contact Barry to let him know the findings.

"Mutley was 18-years old when he was put down in January 2014. It was only a few months after that when the Kennedys captured the footage of the suspected ghost dog.”